Seller Financing/ agent agreement

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I need help with seller financing/RE agent agreement. I am selling a rental unit that I own. I have it listed with an agent and it is on the MLS service. After about 60 days of no offers I began to try to advertise the building myself to potential interested parties. I have found a buyer on my own. I have shown the property to the guy on my own a few times and after a few emails back and forth, we decided to hand the negotiations over to our RE agents for final negotiations and writting the actual contract. My question is, what should the comission that I pay to my agent be? I honestly dont feel that I should pay him full comission considering all the leg work that I have done for selling the property. Can someone please help me out with that and with seller financing in general as I have never done this type of deal before.